[gssapi-openssh.git] / openssh / openbsd-compat / xmmap.c

/*
 * Copyright (c) 2002 Tim Rice.  All rights reserved.
 * MAP_FAILED code by Solar Designer.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/* $Id$ */

#include "includes.h"

#include <sys/types.h>
#ifdef HAVE_SYS_MMAN_H
#include <sys/mman.h>
#endif
#include <sys/stat.h>

#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#include <errno.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>

#include "log.h"

void *xmmap(size_t size)
{
#ifdef HAVE_MMAP
	void *address;

# ifdef MAP_ANON
	address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_ANON|MAP_SHARED,
	    -1, (off_t)0);
# else
	address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
	    open("/dev/zero", O_RDWR), (off_t)0);
# endif

#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
	if (address == (void *)MAP_FAILED) {
		char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
		int tmpfd;
		mode_t old_umask;

		old_umask = umask(0177);
		tmpfd = mkstemp(tmpname);
		umask(old_umask);
		if (tmpfd == -1)
			fatal("mkstemp(\"%s\"): %s",
			    MM_SWAP_TEMPLATE, strerror(errno));
		unlink(tmpname);
		ftruncate(tmpfd, size);
		address = mmap(NULL, size, PROT_WRITE|PROT_READ, MAP_SHARED,
		    tmpfd, (off_t)0);
		close(tmpfd);
	}

	return (address);
#else
	fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
	    __func__);
#endif /* HAVE_MMAP */

}
Commit	Line	Data
cc0583a1	1	/*
7cac2b65	2	* Copyright (c) 2002 Tim Rice. All rights reserved.
	3	* MAP_FAILED code by Solar Designer.
	4	*
cc0583a1	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	*
	14	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	15	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	16	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	17	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	18	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	19	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	20	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	21	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	23	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
7cac2b65	26	/* $Id$ */
7cac2b65	27
cc0583a1	28	#include "includes.h"
cc0583a1	29
30460aeb	30	#include <sys/types.h>
cc0583a1	31	#ifdef HAVE_SYS_MMAN_H
	32	#include <sys/mman.h>
	33	#endif
30460aeb	34	#include <sys/stat.h>
	35
	36	#ifdef HAVE_FCNTL_H
	37	# include <fcntl.h>
	38	#endif
	39	#include <errno.h>
	40	#include <stdarg.h>
	41	#include <string.h>
	42	#include <unistd.h>
cc0583a1	43
	44	#include "log.h"
	45
	46	void *xmmap(size_t size)
	47	{
30460aeb	48	#ifdef HAVE_MMAP
cc0583a1	49	void *address;
cc0583a1	50
cc0583a1	51	# ifdef MAP_ANON
cc0583a1	52	address = mmap(NULL, size, PROT_WRITE\|PROT_READ, MAP_ANON\|MAP_SHARED,
7e82606e	53	-1, (off_t)0);
cc0583a1	54	# else
cc0583a1	55	address = mmap(NULL, size, PROT_WRITE\|PROT_READ, MAP_SHARED,
7e82606e	56	open("/dev/zero", O_RDWR), (off_t)0);
cc0583a1	57	# endif
	58
	59	#define MM_SWAP_TEMPLATE "/var/run/sshd.mm.XXXXXXXX"
dfddba3d	60	if (address == (void *)MAP_FAILED) {
cc0583a1	61	char tmpname[sizeof(MM_SWAP_TEMPLATE)] = MM_SWAP_TEMPLATE;
cc0583a1	62	int tmpfd;
7e82606e	63	mode_t old_umask;
cc0583a1	64
7e82606e	65	old_umask = umask(0177);
cc0583a1	66	tmpfd = mkstemp(tmpname);
7e82606e	67	umask(old_umask);
cc0583a1	68	if (tmpfd == -1)
	69	fatal("mkstemp(\"%s\"): %s",
	70	MM_SWAP_TEMPLATE, strerror(errno));
	71	unlink(tmpname);
	72	ftruncate(tmpfd, size);
	73	address = mmap(NULL, size, PROT_WRITE\|PROT_READ, MAP_SHARED,
7e82606e	74	tmpfd, (off_t)0);
cc0583a1	75	close(tmpfd);
	76	}
	77
	78	return (address);
	79	#else
	80	fatal("%s: UsePrivilegeSeparation=yes and Compression=yes not supported",
	81	__func__);
	82	#endif /* HAVE_MMAP */
	83
	84	}
	85